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Wideband active microwave isolators using GaAs MMIC technology

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1 Author(s)
D. G. Haigh ; Dept. of Electron. & Electr. Eng., Univ. Coll. London, UK

The paper is concerned with circuit designs for wideband microwave isolators realised as monolithic microwave integrated circuits using depletion-mode GaAs MESFETs. An unbalanced version of a previously published balanced design is shown to have an interesting property of an approximately linear transmission function but the port impedances remain nonlinear. A previously published general circuit synthesis method is used to implement an isolator with transmission function and port impedances both of which are linearised. Measurements on a GaAs MMIC implementation are presented

Published in:

IEE Proceedings - Microwaves, Antennas and Propagation  (Volume:143 ,  Issue: 2 )